There are two ways in which that might not be true. Nominally, normal course of events, reversal would not occur fast. But that is an extreme case of “justice delayed is justice denied” - so extreme that Trump could appeal all the way to SCOTUS, IMHO, on the basis that no lower court would take the appeal on a timely basis.It would be like allowing an execution to occur while the defendant is waiting for his appeal to be heard. Waging lawfare against the nominee of a major political party is no small thing.
The other way that a conviction wouldn’t matter a lot is if Biden raises the issue, and Trump simply demands that Biden explain what the alleged “crime” was. Of course Biden would lie, there not being a truthful answer that could be justified to an Independent , let alone a Republican . . .seems like Trump would probably succeed in illustrating just how tendentious the prosecution was. Just for starters, there is federal law against using campaign contributions for personal expenses - and yet the prosecution wants to convict Trump on the theory that hush money for Daniels was strictly a campaign expense having nothing to do with the feelings of Trump’s wife, and should have been accounted as such, rather than as a personal expense. Damned if you do, damned if you don’t.
How important could the distinction possibly be to the public??? Prosecuting a case which, at best, depends on how many angels you think can dance on the head of a pin is no way to actually - you know, pursue justice.